Gastec 138L 便携式气体检测管二氯甲烷检测管CH2Cl2(4~150ppm)

Indicator: 10 to 60 ppm
Measuring Range: 
+ 4 to 10 ppm, Number of Pump Strokes 4
+ 10 to 60 ppm, Number of Pump Strokes 2
+ 60 to 150 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: White → Pale Pink
Reaction Principle: CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Coefficient of Variation: 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
4 to 10 ppm 10 to 60 ppm 60 to 150 ppm
Number of Pump Strokes
4 2 1
Correction Factor
0.4 1 2.5
Sampling Time 3 minutes per pump stroke
Detecting Limit 5 ppm (n=2)
Colour Change White → Pale Pink
Reaction Principle CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Cl2+ 3,3,5,5-Tetramethylbenzidine → Holoquinone
Coefficient of Variation 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Temperature correction is necessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Cl2, Br2, I2   + Pale pink
Unsaturated halogenated HCs 6 ppm + Pale pink
Saturated halogenated HCs 3 ppm + Pale pink
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
50 ppm - 15.5 to 66.9%

 

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